Oscillating pendulum



Feb. 13, 1923. 1,445,365. E. VOLKERS.

OSCILLATING PENDULUM.

FILED FEB. 3.1922.

Patented Feb. 13, 1923.

EMIL VOLKERS, F BERLIN-LANKWITZ., GERMANY.

OSCILLATING PENDULUM.

Application led February 3, 1922. Serial No. 533,959.

Be it known that I, EMrL Vonnnks, a subject of Germany, residing at Berlin-Lankwitz, Germany, have invented certain new and useful Improvements in Oscillating Pendiulums; of which the following is a specification.

his invention relates to oscillating pendulums; and it proposes certain iinprovements, hereinafter fully described, by

virtue of which an increased efciency is obtained, together with decreased cost of construction.

An embodiment of the invention is illustrated in the accompanyingl drawing in which Figures l and 2 are, respectively, a front elevation and a side elevation showing the improved pendulum in use.

Referring` more particularly to the drawing, the pendulum comprises two separate sections or members l and 2; the upper section l having the form of a nickle-steel rod, and the lower section 2 consisting of a nickle-steel wire, the lower end of which has attached to it the weight The latter is given. a shape such that its air .resistance is the same at all points, i. e., a cylinder or sphere, by preference. The rod l is attached to a pivotal support 5 by means of a suspension spring 4, said support 5 being suitably mounted in the frame or cage 6 of the clockwork; and the usual fork 7 is employed and is engaged with said rod.

The portion of a pendulum which is below the fork, is subjected almost exclusively to traction, as .is well understood; and .it is to be observed that in the present construction this portion consists of the wire 2. The diameter of the wire is chosen so that the 10 wire will be held taut by the pullingr force of the weight 35 and that fact, together with the high mechanical strain to which the wire is subjected, will prevent the occurrence of jerks to compensate for interior tension.

This absence of jerks will be conducive to a steadiness ol" compensation which is practically impossible to obtain when the pendulum takes the form o a single nickle-steel rod, even though such rod has been subjected to long tempering and furthermore, the small amount of nickle steel necessary for the construction of the pendulum wire will render the latter almost insensible to magnetic influences-in which respect it is distinguished from the ordinary pendulum ron-and will permit it to be manufactured at comparatively low cost and, hence, to be installed in cheaper' grades of clocks than has heretofore been possible.

A further :ulvantag'e of the present construction, that the center of oscillation almost coincides with the center of gravity of the weight, for which reason the pendulum may be made shorter than usual. lsochronism is promoted by the flexion or bending of the wire, which cannot take place with the ordinary rod; and since this iieXion or bending will increase with the increasing amplitude of the swing, a corresponding decreasing of the mathematical length of the pendulum will result, as required for isochronism.

I claim as my invention:-

l. An oscillating pendulum, comprising a suspension spring,- a weight; and a connection between the spring and the weight consisting of a rigid upper member, and a freely flexible lower member structurally separate from the upper member and attached to the lower end thereof.

El. A n oscillating pendulum, comprising' a suspension spring; a roel suspended therefrom; a wire suspended from the lower end of the rod; and a weight suspended from the lower end of the wire,

In testimony whereof I have alllxed my signature.

E MIL V OLKE RS.

lVi tnesses MAX lVAoNnn, PAUL MAscow. 

